Error message: PHP Fatal error: Uncaught TypeError ... Argument #2 ($data) must be of type array, null given

Problem

When attempting to activate Borlabs Cookie, the following error message is displayed:

Uncaught TypeError: Borlabs\Cookie\System\Script\BorlabsCookieGlobalsService::addProperty(): Argument #2 ($data) must be of type array, null given, called

Uncaught TypeError: Borlabs\Cookie\System\Script\BorlabsCookieGlobalsService::addProperty(): Argument #2 ($data) must be of type array, null given, called

Cause

Borlabs Cookie attempts to load WordPress's default CodeMirror editor by using the wp_enqueue_code_editor() function.

Under normal circumstances, this function should return an array. In this case, however, it returns null, which results in a TypeError.

Solution

Since WordPress 4.9.0, CodeMirror has been included as a standard component of WordPress. If the wp_enqueue_code_editor() function does not return the expected array, this indicates a problem. In most cases, the issue is caused by another plugin or the active theme.

To identify the source of the problem, we recommend deactivating all other plugins and temporarily switching to a default WordPress theme.

If the issue no longer occurs afterward, reactivate the plugins one at a time and test after each activation. This will allow you to systematically identify the plugin or theme responsible for the issue.